How severe is CVE-2021-4356?

CVE-2021-4356 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-4356 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4356?

CVE-2021-4356 affects Najeebmedia Frontend File Manager Plugin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4356?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-4356 published?

CVE-2021-4356 was published on 2023-06-07 and last updated on 2026-06-17.

CVE-2021-4356

CVE-2021-4356 is a critical-severity vulnerability in Najeebmedia Frontend File Manager Plugin with a CVSS 3.x base score of 9.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Najeebmedia Frontend File Manager Plugin
Published: 2023-06-07
Last modified: 2026-06-17

Description

The Frontend File Manager plugin for WordPress is vulnerable to Unauthenticated Arbitrary File Download in versions up to, and including, 18.2. This is due to lacking authentication protections, capability checks, and sanitization, all on the wpfm_file_meta_update AJAX action. This makes it possible for unauthenticated attackers to download arbitrary files on the site, potentially leading to site takeover.

Frequently asked questions

What is CVE-2021-4356?: The Frontend File Manager plugin for WordPress is vulnerable to Unauthenticated Arbitrary File Download in versions up to, and including, 18.2. This is due to lacking authentication protections, capability checks, and sanitization, all on the wpfm_file_meta_update AJAX action. This makes it possible for unauthenticated attackers to download arbitrary files on the site, potentially leading to site takeover.
How severe is CVE-2021-4356?: CVE-2021-4356 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-4356 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4356?: CVE-2021-4356 affects Najeebmedia Frontend File Manager Plugin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4356?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-4356 published?: CVE-2021-4356 was published on 2023-06-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:najeebmedia:frontend_file_manager_plugin:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Najeebmedia Frontend File Manager Plugin

CVE-2021-4368 — Critical (CVSS 9.9): The Frontend File Manager plugin for WordPress is vulnerable to Authenticated Settings Change in versions up to, and…
CVE-2021-4365 — High (CVSS 7.2): The Frontend File Manager plugin for WordPress is vulnerable to Unauthenticated Stored Cross-Site Scripting in versions…
CVE-2021-4350 — High (CVSS 7.2): The Frontend File Manager plugin for WordPress is vulnerable to Unauthenticated HTML Injection in versions up to, and…
CVE-2023-5105 — Medium (CVSS 6.5): The Frontend File Manager Plugin WordPress plugin before 22.6 has a vulnerability that allows an Editor+ user to bypass…
CVE-2021-4359 — Medium (CVSS 6.5): The Frontend File Manager plugin for WordPress is vulnerable to Unauthenticated Arbitrary Post Deletion in versions up…
CVE-2021-4344 — Medium (CVSS 6.4): The Frontend File Manager plugin for WordPress is vulnerable to Privilege Escalation in versions up to, and including,…

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